Synthesis of 2,6-monosubstituted bisphenol A isophthalaldehyde phenolic resin and its applications in reversible thermochromic composite NiBR film
A 2,6-monosubstituted bisphenol-A(BPA)-isophthalaldehyde(IPD)oligomerized phenolic resin with a num-ber-average molecular weight of 1.150×103 g/mol and a polydispersion index of 1.004 was synthesized through micro-wave-assisted solution copolycondensation in an open system using BPA and potential biomass IPD as monomers.This potential biomass IPD has a low melting point,a weak π-π stacking interaction,and a slightly higher activity than tere-phthalaldehyde(TPD).The structure of the as-synthesized phenolic resin was confirmed by 1H-NMR,13C-NMR,and FTIR.A reversible thermochromic composite Nickel-based butadiene rubber(NiBR)film was prepared by using the as-synthesized phenolic resin as a color developing agent.The results indicated that the flexibility of BPA-IPD and partially generated carboxyl end groups of IPD facilitated to generate low-and high-temperature eutectic phases with lower latent heat due to a low melting point and a weak π-π stacking interaction of IPD.This improved the crystallization limit in the low temperature eutectic phase and color changing speed of the NiBR film and enhanced its compatibility with 1,4-high cis-NiBR and stability.The total color difference of the NiBR film was optimized to be around 85 at 12～37℃through a formula.The absorption-scattering color depth difference of the NiBR film were approximately 20 and 45 at visible light range of 480～600 and 600～660 nm,respectively,and its color changing speed was 2.14 s-1.
2,6-monosubstituted bisphenol A isophthalaldehyde phenolic resinreversible thermochromiccomposite filmpreparation
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